Mary c



l. M. BROWN.

M'UFFLER.

APPLICATION man murio. una.

1,317,858. Patented om. 7,1919.

THB ooumlu mmnilmn cn.. WASHINGTON. u. c.

UNITED STATES PATENT OFFICE.

JAMES MILTON BROWN, OF GROVE CITY, PENNSYLVANIA; MARY C. BROWNADMINISTRATBIX 0F SAID JAMES M. BROWN', DECEASED.

IE'UFFLER.

Speeication of Letters Patent.

Patented Oct. 7, 1919.

Application led July 10, 1918. Serial No. 244,149.

To all whom it may concern.'

Be it known that I, JAMES M. BROWN, a citizen of the United States,residing at Grove City, in the county of Mercer and State ofPennsylvania, have invented certain new and useful Improvements in Muffiers; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to mullers for exhaust ases, and has for itsobject to provide a simp e, practical and elicient device of thecharacter described, which practically elimlnates the noises produced byexhaust gases under pressure, such as emanate from internal combustionengines and other motors employing gaseous pressure, without producingany back pressure 1n the motor. To these ends the invention comprises acham ber having an inlet adapted to be attached to the exhaust port orpipe of an engine or the like, and an outlet at the opposite end of thechamber, said chamber being formed of inner and outer walls, preferablyconical in shape, so disposed that the cross sectional area of thechamber increases from the inlet to the outlet, and the walls of thechamber converge toward the outlet, with means adjacent the outlet tochange the direction of flow of the escaping gases and deliver the sameinto a recess or chamber, which 1s preferably defined by a concave plateor septum, located within the mner wall or conlcal member, the partsbein so constructed and arranged that the ex aust gases are graduallyexpanded and conducted 1n a gradually thinning la er n contact with theinner and outer wa s, which produces a rapid dilusion and dispersion ofthe heat of the gases, said gases belng turned back- Ward and inwardtoward the center of the muilier, which may be termed the .collisionchamber, Where the said gases enterin from all directions collide andare ther. ly deprived of their kinetic energy and ultimately pass out ofthe mufller Without noise Vand without the production of back pressure.

The invention illustrated in the accompanying drawing, shows the muillerin vertical cross section.

Referring to the drawing, 1 indicates the exhaust pipe of the internalcombustion motor or other gas operated engine or apparatus, to the endof which the muilier is adapted to be attached by any suitable means.The body of the mulller comprises an outer conical member 2 and an innerconical member 3, which are in axial alinement with cach other and whichconstitute inner and outer walls of an annular, generally conicalchamber Ll. The pitch of the inner cone 3 is made somewhat less thanthat of the outer cone 2, so that the walls of the two conical membersgradually converge or approach each other and leave an annular openingbetween the lower marginal edge of cone 3 and the adjacent wall of cone4. The conical members are so proportioned and arranged that the crosssectional area of the space inclosed by the walls is larger than thecross sectional area of the exhaust pipe 1, and gradually increasestoward the lower or discharge end of the chamber 4, so that the openinconstitutin the discharge end of the cham er is severa times as great asthe opening constituting the inlet of said chamber adjacent the exhaustpipe 1. The conical members 2 and 3 are secured together in rigidrelation by means of relatively thin metal spacing strips 6 and 7 at thetop and bottom of the conical members, and which are attached to thewalls of said conical members by any suitable means.

Extending from the lower end of the outer Wall 2 is an annular deectorplate 8, which is curved downwardly below and around the lower edge ofthe inner conical wall 3, and then upwardly toward the center of theinner cone, the radius of curvature of the deliector plate graduallyincreasin toward the center so as to provide a gradua change ofdirection or reversal of flow of the exhaust gases escaping from thechamber 4, to cause the said gases to move from all sides toward thevertical axis of the coni-cal member 3 and to collide, whereby anyresidual,

a chamber having sin inlet en outlet and inner and outer conical wellsconverging to- Ward the outlet to produce a. Yges assage of increasingcross sectional area. an of graduall decreasingi width, an inwardlycurved de ector exten ing from the outer wall adjacent the outlet, and aconcave septum lochamber within which the escaping gases 10 collide.

' In testimony whereof I ax my signature.

JAMES MILTON BROWN.

copie! of this pltent my be obtained for ive cents each, by addrelsingthe ommnloner o! IPM/enti, Washington, D. C.

